OSHA Module 11 Questions and
Answers | Latest Update | 2024/2025 |
Correct & Verified
Why should workers never enter an unprotected trench?
✔✔ Without protective systems, the walls can collapse, leading to serious injury or death.
How deep does a trench need to be before protective measures are required?
✔✔ At 5 feet deep, a protective system such as shoring, shielding, or sloping is required unless
the soil is stable rock.
What must be done before workers enter an excavation?
✔✔ A competent person must inspect the trench and surrounding area for hazards.
Why is soil classification important in excavation work?
✔✔ Different soil types have varying levels of stability, affecting the type of protective system
needed.
How does water affect trench stability?
1
, ✔✔ Water weakens soil, increasing the risk of collapse and making conditions more hazardous.
What is a trench box used for?
✔✔ A trench box, or shield, is used to protect workers from cave-ins by reinforcing the trench
walls.
Why should heavy equipment be kept away from the edge of an excavation?
✔✔ The weight can cause the trench walls to collapse or push loose soil into the excavation.
What should workers do if they notice cracks forming near a trench?
✔✔ Leave the area immediately and report the issue to a supervisor or competent person.
How can a spoil pile create a hazard near an excavation?
✔✔ If placed too close, loose soil can fall back into the trench and bury workers.
Why is it dangerous to work in a trench after heavy rain?
✔✔ Rainwater makes the soil unstable, increasing the chance of a sudden collapse.
2
Answers | Latest Update | 2024/2025 |
Correct & Verified
Why should workers never enter an unprotected trench?
✔✔ Without protective systems, the walls can collapse, leading to serious injury or death.
How deep does a trench need to be before protective measures are required?
✔✔ At 5 feet deep, a protective system such as shoring, shielding, or sloping is required unless
the soil is stable rock.
What must be done before workers enter an excavation?
✔✔ A competent person must inspect the trench and surrounding area for hazards.
Why is soil classification important in excavation work?
✔✔ Different soil types have varying levels of stability, affecting the type of protective system
needed.
How does water affect trench stability?
1
, ✔✔ Water weakens soil, increasing the risk of collapse and making conditions more hazardous.
What is a trench box used for?
✔✔ A trench box, or shield, is used to protect workers from cave-ins by reinforcing the trench
walls.
Why should heavy equipment be kept away from the edge of an excavation?
✔✔ The weight can cause the trench walls to collapse or push loose soil into the excavation.
What should workers do if they notice cracks forming near a trench?
✔✔ Leave the area immediately and report the issue to a supervisor or competent person.
How can a spoil pile create a hazard near an excavation?
✔✔ If placed too close, loose soil can fall back into the trench and bury workers.
Why is it dangerous to work in a trench after heavy rain?
✔✔ Rainwater makes the soil unstable, increasing the chance of a sudden collapse.
2
